PHILADELPHIA -- Philadelphia's police commissioner apologized Thursday for his remarks following the arrests of two black men at Starbucks. Video of the racially-charged incident went viral and set off a week of protests. Those protesters showed up this time outside Philadelphia's police headquarters -- despite an apology from commissioner Richard Ross.

"Messaging is important and I failed miserably in this regard," Ross said.

Despite that admission, Ross defended the actions of his officers when they arrested two black men at a Starbucks last week. The incident was captured on cellphone video and posted online.

@Starbucks The police were called because these men hadn’t ordered anything. They were waiting for a friend to show up, who did as they were taken out in handcuffs for doing nothing. All the other white ppl are wondering why it’s never happened to us when we do the same thing. pic.twitter.com/0U4Pzs55Ci

Michelle Miller is the co-host of "CBS This Morning: Saturday." As an award-winning correspondent based in New York, she has reported for all CBS News broadcasts and platforms. She joined CBS News in 2004.